Responses
There's a few manga like that already:
Re:Monster
http://www.mangago.me/read-manga/remonster/
Tensei Goblin dakedo Shitsumon aru?
http://www.mangago.me/read-manga/tensei_goblin_dakedo_shitsumon_aru/
Suterareta Tensei Kenja ~ Mamono no Mori de Saikyou no dai ma Teikoku o Tsukuriageru ~
(not actually a goblin but he is raised by them)
http://www.mangago.me/read-manga/suterareta_tensei_kenja_mamono_no_mori_de_saikyou_no_dai_ma_teikoku_o_tsukuriageru/
Goblin Is Very Strong
(female lead)
http://www.mangago.me/read-manga/goblin_is_very_strong/
The goblin is the best.. they should ake the goblin as a main character